644149174 has 16 divisors (see below), whose sum is σ = 986998608. Its totient is φ = 315181152.

The previous prime is 644149123. The next prime is 644149183. The reversal of 644149174 is 471941446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34429 + ... + 49735.

It is an arithmetic number, because the mean of its divisors is an integer number (61687413).

Almost surely, 2^644149174 is an apocalyptic number.

644149174 is a deficient number, since it is larger than the sum of its proper divisors (342849434).

644149174 is a wasteful number, since it uses less digits than its factorization.

644149174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15759.

The product of its digits is 96768, while the sum is 40.

The square root of 644149174 is about 25380.0940502592. The cubic root of 644149174 is about 863.6321835083.

The spelling of 644149174 in words is "six hundred forty-four million, one hundred forty-nine thousand, one hundred seventy-four".